AUTOMATIC APPARATUS FOR SUCKING OFF LIQUID Russian patent published in 1995 - IPC

FIELD: medical engineering. SUBSTANCE: this apparatus includes suction unit receiving vessel having detachable cover consisting of upper portion 4 and lower portion 5 between which is positioned flexible membrane 6 whose rigidity regulator is combined with pneumatic valve. Cover upper portion 4 has openings 10 for communicating chamber disposed above membrane with atmosphere. In cover lower portion are disposed inlet connection 22, outlet connection 13 and safety valve 28. Inlet connection 22 is fitted into opening which is inclined relative to base. Inner end portion of this inlet connection communicates with curved receiving pipe 25 having branch 26 in its upper portion and inner diameter exceeding inner diameter of inlet connection 22. Outlet connection 13 is fitted into opening which communicates with chamber disposed under membrane and receiving vessel. Safety valve 28 is located in recess which communicates with outlet passage which incorporates aerodynamic source of acoustic waves 34. Disposed in lower portion of cover is adjustable emergency vacuum relief valve 36 and additional aerodynamic source of acoustic waves 37 tuned to different frequency. EFFECT: more sophisticated design. 2 cl, 1 dwg